Before this change, output from `alphanet.sh` looked like the following:
```
New contract alias 'my_account' saved.
Contract memorized as my_account.
\033[32mThe node is now running.\033[0m
\033[32mThe baker is now running.\033[0m
\033[32mThe endorser is now running.\033[0m
\033[33mWarning: the container contains a new version of 'alphanet.sh'.\033[0m
\033[33mYou might run './scripts/alphanet.sh update_script' to synchronize.\033[0m
```
I.e. control characters showed up, instead of modifying the color of the text
output. Repro'd on Container Linux (CoreOS) 1492.3.0.
After this change, `The node is now running` shows up in green &c.
